Add fog deprecation warning

lib/cloud_controller/blobstore/fog/fog_client.rb

@@ -13,6 +13,9 @@ class FogClient < BaseClient
       attr_reader :root_dir
 
       DEFAULT_BATCH_SIZE = 1000
+      DEPRECATION_MESSAGE = '[DEPRECATION WARNING] The fog blobstore client is DEPRECATED and will be REMOVED. ' \
+                            "Please migrate to blobstore_type 'storage-cli' as soon as possible. " \
+                            'See https://github.com/cloudfoundry/community/blob/main/toc/rfc/rfc-0043-cc-blobstore-storage-cli.md for details.'.freeze
 
       def initialize(connection_config:,
                      directory_key:,
@@ -30,6 +33,7 @@ def initialize(connection_config:,
         @max_size = max_size
         @aws_storage_options = aws_storage_options
         @gcp_storage_options = gcp_storage_options
+        logger.warn('blobstore.fog-deprecated', message: DEPRECATION_MESSAGE)
       end
 
       def local?

spec/unit/jobs/runtime/service_operations_initial_cleanup_spec.rb

@@ -6,7 +6,7 @@ module Jobs::Runtime
       subject(:job) { ServiceOperationsInitialCleanup.new }
 
       let(:fake_orphan_mitigator) { double(VCAP::Services::ServiceBrokers::V2::OrphanMitigator) }
-      let(:fake_logger) { instance_double(Steno::Logger, info: nil) }
+      let(:fake_logger) { instance_double(Steno::Logger, info: nil, warn: nil) }
 
       it { is_expected.to be_a_valid_job }
 

spec/unit/lib/cloud_controller/blobstore/fog/fog_client_spec.rb

@@ -29,6 +29,11 @@ module Blobstore
         Fog::Mock.reset
       end
 
+      it 'logs a deprecation warning on initialization' do
+        expect_any_instance_of(Steno::Logger).to receive(:warn).with('blobstore.fog-deprecated', hash_including(:message))
+        FogClient.new(connection_config:, directory_key:)
+      end
+
       describe 'conforms to blobstore client interface' do
         let(:deletable_blob) { instance_double(FogBlob, file: nil) }